1612164481 has 4 divisors (see below), whose sum is σ = 1655736532. Its totient is φ = 1568592432.

The previous prime is 1612164479. The next prime is 1612164493. The reversal of 1612164481 is 1844612161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1844612161 = 7 ⋅263516023.

It can be written as a sum of positive squares in 2 ways, for example, as 669981456 + 942183025 = 25884^2 + 30695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1612164481 - 2¹ = 1612164479 is a prime.

It is a super-2 number, since 2×1612164481² = 5198148627595998722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1612164401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21785970 + ... + 21786043.

It is an arithmetic number, because the mean of its divisors is an integer number (413934133).

Almost surely, 2^1612164481 is an apocalyptic number.

It is an amenable number.

1612164481 is a deficient number, since it is larger than the sum of its proper divisors (43572051).

1612164481 is an equidigital number, since it uses as much as digits as its factorization.

1612164481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43572050.

The product of its digits is 9216, while the sum is 34.

The square root of 1612164481 is about 40151.7680930741. The cubic root of 1612164481 is about 1172.5637115602.

The spelling of 1612164481 in words is "one billion, six hundred twelve million, one hundred sixty-four thousand, four hundred eighty-one".